Rock drill



G. M NELL ROCK DRILL Sept. 27,

2 Sheets-sheet 1 Filed Nov 9 1920 ROCK DRILL Filed Nov. 9, 1920 2 Sheets-Sheet 2 Patented Sept. 27, 1927.

UNITED STATES PATENT OFFICE.

GUSTAVE M. NELL, OF DENVER, COLORADO.. .ASSIGNOR TO THE DENVER ROCK DRILL MANUFACTURING COMPANY, CF DENVER, COLORADO, A CORPORATION OF DELA- WARE.

ROCK DRILL.

Application led November 9, 1920. Serial No. 422,821.

The present invention relates to means for governing the movement of {luid-operated feeding means for rock drills and similar machines, the object in this case being to provide an effective mechanism for controlling the braking action of the parts.

1n the accompanying drawings Figure 1 is a view in elevation and in section of a drilling machine, showing the improved controlling means,

Figure 2 is a cross sectional View on the line A2*-2 of Figure 1,

Figure 3 is a longitudinal sectional view on an enlarged scale through the control mechanism,

Figure 4 is a sectional view on the line 4- 4 of Figure 3.

A portion of a drill actuating motor is shown at 5, and may be of any well known or desired construction. Connected thereto is an eXtensible feeding means, comprising a cylinder member 6, in which reciprocates a piston 7 having a piston rod that projects through the outer head 8 of the cylinder member, and is provided with a suitable spur 9 to engage the supporting surface.

lnterposed between the inner end of the cylinder member 6 and the rear head 10 of the motor 5, is a pair of head blocks 11 and 12 located end to end, and interposed betweenl the head block 12 and the adjacent end of the cylinder member 6, is a collar disk 13. The head block 11 constitutes in effect a cylinder, being provided with a pis ton chamber 14 and the head block 12 is also provided with a chamber 15.

Rotatably mounted in the collar disk 13 is a rod 16 that passes through the piston head 7 and has a threaded engagement 17 therewith. It will thus be evident that as the piston 7 moves in the cylinder 6, the rod will be rotated. The portion of the rod that is located in the chamber 6 is provided with an abutment flange or collar 18, and the terminal of said rod above the flange 18 is in the form of an angular head 19. On this head are placed two sets of friction disks 20 and 21. The disks 20 have angular openings that receive the angular head 19, so that said disks will rotate with the head. The disks 21 have circular openings 22, as shown in Figure 4, of suflicient diameter to permit the rotation of the head 19, and said disks 21 are provided further more with outstanding lugs or keys 22a that engage in grooves 23 formed in the walls of the chamber 15. A bearing disk 24 is located at the outer end of the two sets of disks 2O and 21, and operating against said bearing disk 24 are plunger pins 25 that project into the piston chamber 14. In said piston chamber is located a reciprocatory piston 26 that bears upon the plunger pins 25, as clearly illustrated in Figures 1 and 3.

Air or other motive fluid is Supplied to the apparatus from any suitable source and is delivered in the usual manner to a valve casing 27, In said casing is located the usual rotary throttle valve 28 having an axial intake port 29 with lateral delivery ports 30 and 31. The port 30 is movable into and out of register with a passageway 32 that directs the motive fluid to the tool actuating motor 5, and the port S1I is movable into and out of communication with a port 83 communicating with a passageway 34 extending through the head blocks 11 and 12 and communicating with the chamber l5. This chamber 15 is in communication with the upper end of the feed cylinder 6 by means of a port 85 through the collar disk 13. The port 33 is also in communication with a circular groove 36 formed in the face of the motor head 10 and said groove communicates with a passageway 37 leading to the chamber 38 0f a valve casing 39 formed on one side of the head 11. Referring to Figure 2, it will be noted that the chamber 38 contains a reciprocating valve 40 having a stem 41 projecting from one end of the casing and adapted to be borne against by the offset crank arm 42 of a hand lever 43 fulcrumcd on one of the side bolts 44 of the machine.

In the present embodiment the valve is normally moved to and held in its outer position by a coiled springv 45 located behind it, though other means may be employed. This valve is provided with an annular'groove 46, which when the valve is in its normal position as shown in Figure 2, is in communication with an exhaust port 47 and with a passageway 48 leading from the chamber 34 to the piston chamber 14 above the piston 26. When the valve is moved rearwardly or inwardly, however, it

will Close the exhaust port 47 and bring the Supply passageway 37 into communication with the passageway 48.

The operation of the apparatus is substantially as follows: if motive fluid is admitted to the tool actuating motor and the extensible feeding means through the throttle valve 28', both will be actuated, and as long as the valve 40 is in its normal position, the disks 2O and 2l being relatively free, will permit the red i6 to rotate freely, as the piston member of the feeding means is projected'by fluid against the piston 7. If at any time it is desired to control the speedzofry movement of the piston 7 or' stop it entirely, it is only necessary to actuat'e the handle lever 43 and move the valve 40 inwardly, whereupon the fluid under pressure is admitted to the vchamber 14V and against the piston 26. 'lbis will cause pressure to be transmitted by the pins 25 against the collar 24, and thereby bring the relatively rotating sets of disks 2O and 2l into frictional engagement. Upon releasing` the handle 43, the valve 40 will return to its normal position, thereby cutting off the supply of motive iiuid to the chamber 14, and allowing that which is contained therein to exhaust through the port 47.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be appa-rent to those skilled in the art, Without further description, and it will be understood that. various changes in the size, shape, proportion and minor details of construction. may be resorted to without departing from the s'irit of sacrificing any of the advantages o the invention.

Having thus fully described my invention, what I claim as new, and desire to secure Letters Patent, is:

l. The combination with a tool-actuating motor, of extensible' .feeding means therefor comprising fluid actuated slidably telescoping membersa rotatable brake device rotated by said members on their slidable movement, fluid operated means for affording resistance to the rotation of the. brake device, and manually actuated means for controlling the liowofu fluid to said fluid operated Imeans to vary the amount of resistance it imparts.

Q The combination with a tool-actuating means, of extensible feeding 'means therefor comprising fluidactuated slida'bly telescopling,members therefona rotatable brake device located longitudinally/ cf the members andA journaled on one member andl having a screw engagement vwith 'the other that causesI the rotation of the brake device when the Ifeeding means' ifs-extended, and iiuid operated 'means mounted ,on the `first mentioned member for imparting resistance to the rotation of the device,

,ses

3. The combination with a tool-actuating motor, of extensible feeding means therefor, including a cylinder member and a piston member operating in the cylinder member.l

a brake device extending longitudinally of the members and rotatably mounted on one member and having a sliding engagement with the other member, means for causing the brake device to rotate when the feeding means is extended, means on one of the members and frictionally engaging said device for resisting the rotary movement, and av fluid operated means for varying such resistance.

4. The combination with a tool-actuating motor, of extensible feeding means therefor, includingl a cylinder member and piston member operating in the cylinder member, a brake for the feeding means havinga. rod extending into the piston member, said rod having a threaded engagement with the piston and a rotatable mounting in the cylinder member, friction devices on the rod, and fluid operated means for' imparting varying degrees of resistance to the friction devices.

5. The combination with a tool-actuating motor, of fluid operated extensible feeding means therefor comprising a cylinder member and a piston operating in the cylinder member, a rotary device operated by the members on their relative movement, rela tively rotatable friction members, certain of which are moved by the device, and fluid operated means for exerting pressure against the friction members.

6. The combination with a tool-actuating motor, of fluid operated extensible feeding means therefor, comprising a cylinder mem'- ber and a piston operating on the cylinder member, a. rotary device operated by the members on their relative vement, relatively rotatable friction dis rs, certain of which are moved by the device, and 'fluid operated means for exerting varying degrees of pressure against the friction members.

7. The combination with a tool-actuating motor, of fluid ope-rated extensible feeding means therefor comprising a cylinder member fixed at one end to the motor and a piston operating inthe cylinder member and having a tubular rod that is movable through t'he'free end of the cylinder member and is held against rotation therein, a rotatable rod fixed against material longitudinal movement With respect to the cylinder member`and extending into the piston rodsaid rod having a threaded engagement with the piston, a plurality of relatively rotatable friction disks on the rod, a cylinder, and a piston4 in the cylinder that acts on the disks for relatively moving said disks.

8. The combination with a tool-actuating motor, of extensible fluid operated feeding means for the motor comprising slidably telescoping members, a br'ake for controlling ill) the movement of the feeding means including,v a device rotatably mounted on one member and rotated by the other member on the relative moven'ient of said members, a normally inactive friction means for resisting the rotary movement of the device, duid operated means mounted on one of the members for making said friction means active, and valve controlled means for supplying fluid under pressure and cutting it oli' from the fluid operated means when the feeding means and motor are in operation.

S). The combination with a tool-actuating motor, of extensible iuid operated feeding means for the motor comprising slidably telescoping menibers, a brake for the feeding means including a device rotatably mounted on one member and having a screw engagement with the other that rotates said device on the relative movement of said members, friction means for resisting the rotary movement of the device, and fluid operated means mounted on the member on which the device rotates foi varying the frictional resistance of said friction means.

lt). The combination With a tool-actuating motor, of a feed cylinder, a head interposed between the motor and cylinder and having` a chamber, a feed piston operating in the cylinder, a rod journaled at the head end of the cylinder and having a screw engagement with the piston, friction disks for' resisting the rotary movement of the rod, a piston in the head chamber for pressing the disks together, means for supplyingy motive fluid to the tool-actuating motor and to the feed cylinder, means for directing,r a portion of the motive fluid to the chamber to act against the piston, and a valve controlling the directing means.

In testimony whereof, l allix my signature.

GUSTAVE M. NELL. 

